Lathe



(No Model.)

P. SHELLENBACK.

LATHE.

6N0. 364,966. Patented June 14, 1887.

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I Fries,

PATENT PETER SHELLENBACK, OF RICHMOND, INDIANA.

LATHE.

SPECIFICATION forming part of Letters Patent No. 364,966, dated June 14, 1887.

Application filed February 2?, 1887. Serial No. 220,139.

To all whom it may concern.-

Be it known that I,'Pn'rna SIIELLENBACK, of Richmond, \Vayne county, Indiana, have invented certain new and useful Improvements in Lathes, of which the following is a specification.

This invention pertains to lathes for boring and turning pulleys, and the invention will be readily understood from the following description, taken in connection with the ac' eompanying drawings, in whieh Figure l is a front elevation of a lathe e.\'- emplifying my improvements, the tailstock, the chuck, the pulley held by the chuck, and portions of the head-stock and bed appearing in vertical section, and the tool-post being omitted from the slide rest nearest the spectator; Fig. 2, a plan of the head-stock and of the left-hand ends of the rails; Fig. 3, a face view of the crank Q, which effects the feeding motion of the railscrew, the feed-rods and the ratchet-arms of the rail-screws being shown in connection therewith; Fig. 4, an elevation of theinner face of the tail-stock, showing also the lathe-bed in vertical transverse section; and Fig. 5, a face view of the chuck with its clamping-ring.

In the drawings, A indicates the lathe-bed; B, the head-stock constructed and secured to the bed, as usual; 0, the tail-stock rigidly secured at the tail end of the bed; D, the arbor journaled,as usual, in the headstock, and preferably bored throughout its length to permit thepassage thereinto of boring-bars; E, a spurgear fast on the arbor; F, another but similar spurgear fast on the arbor; G, a back shaft journaled in the head-stock to the rear of and parallel with the arbor; H, a spur-gear splined upon the back shaft and arranged to mesh with gear F, the spline permitting the gear H to be moved along its shaft, so as to mesh with or be free from the gear, if so desired; J, a pinion similarly splined upon the back shaft and arranged to mesh with the gear E; K, a driving-cone on the back shaft, by

(No model.)

naled in the head-stock below and parallel with -the arbor; N, a clutch upon the shaft, serving as a meansby which the pinion L may be locked to the shaft when it is desired that the shaft shall turn with the pinion; O, a shaft disposed longitudinally within the lathe-bed and journaled therein; I, a pair of gears serving to transmit motion from the shaft M to shaft 0; O. a feed-crank upon the inner end of shaft M, said crank being provided in a common manner with an adjustable crank-pin, the crank lying just below the arbor and against the inner end of the headstock; R, a pair of rails supported by the lathe-bed, one rail at each side of the bed, these rails being provided each with a slide-rest and feed-screw, as is common with the rails of metal-planing machines, and, frequently, of pulley-lathes; S, pawl-aml-ratchet mechanism, of the usual character, at the head-stock end of the rails, serving in effecting the intermittent rotation of the rail-screws to cause the longitudinal traverse of the turning-tools; T, a pair of feed-rods, with their inner lower ends engaging the crank-pin of the crank Q, and with their outer ends engaging the pawlarms of the pawl-and-ratchet mechanism in the manner usual with such feed-rods as singly employed in connection with metal-planing machines; U, a tail-spindle, the same being fitted to both slide and revolve in the tailstoek; 'V, atailscrew for traversing thespindle, the same being provided with a hand wheel, by means of which the traversing of the spindle can be effected by hand, and also with pawl-aml-ratehet mechanism through which it may receive intermittent rotation by power; \V, a feed-crank, similar to crank Q, upon the tail end of shaft Q; X, a feed-rod, reaching from this crank to the pawl-and-ratchet mechanism of the screw V; Y, a spur gear splined to the tail-spindle; Z, a spur-gear upon the shaft 0, below the tail-stock; a, a train of gearing, serving to transmit motion from gear Z to gear Y; b, a chuck secured to the end of the lathe-arbor, and provided with'an axial bore from the nose of the arbor outward; c, an

enlarged cup-shaped nose to the chuck; (Z, a

be operated upon by the tools, the arms of the pulley being clamped between the clamp of the clamp-ring and the face of the chuck-nose,

- one side of the pulley-hub entering the cupportion of the chuck-nose; f, a cylindrical bor-' ing-bar secured to the tailspindle, and intended to rotate and slide therewith; g, a double-ended cutter of ordinary construction, secured in the boring-bar at about its midlength-as by means of mortise andkey-in a well-known manner, and h a bushing in the outer end of the axial bore of the chuck, this bushing fitting and serving to support the hering-bar. Motion is given to the back shaft by a suitable belt, the gearI-Ibeingmoved along the back shaft so as not to engage gear F, and the pinion J being moved along the back shaft, so as to engage pinion E,as shown in the drawing, the back shaft serves to impart motion to the arbor and to the pulley held by the chuck. The revolution of the arbor gives motion to pinion L, and, when the clutch N is thrown into engagement with the pinion motion becomes transmitted to the feed-crank Q, and through the medium of rods T oseillating motion is imparted to the pulley-arms upon the ends of the rail. By this means the longitudinal feeding motion isimparted to the slide-rest. Under the circumstances referred to the pulley may be turned by lathe-tools in the two slide-rests. The rails should be secured adj ustably to the bed,so as to be capable of being moved to and from each other according as pulleys of small or large diameter are being operated upon,thus permittingthe work to be done with turning-tools projecting buta short distance from the tool-post. The rails may of course be secured parallel to the axis of the lathe, so as to turn the face of the pulleys straight; or the rails may be adjusted angularl y with reference to the axis of the lathe, so as to produce a crowning face upon the pulleys. These adjustments of the rails are wellknown devices in connection with pulleylathes.

The manner of securing the pulley inthe chuck will be obvious from the drawings, the arms of a pulley being simply clamped between the clamp-ring and the nose of the chuck. The nose of the chuck being faced off truly, it follows that the finished pulley as it revolves upon its axis will have its arms in a plane at slowly in one direction, the tail-spindle, with its boring-bar, revolves more rapidly in the other direction, the rotary motion being effected through the shafts N and O and their eonnectinggearing. At the same time the endwise feeding of the boring-bar is effected by the crank W transmitting motion to the feed-screw V through the pawl-and-ratchet mechanism. By throwing clutch N out of engagement the rotary motion of the-tail-spindle is stopped. In case boring only is to be done, or in case very small pulleys are to be turned, a greater speed can be given to thelathe-arbor by'sliding pinion J out of gear and sliding gear H into gear. By this means two changes of speed may be secured in connection with each step of the driving-cone. As the boring-bar feeds inward, its end is supported in the bushing h, and its end passes into the axial bore of the chuck, and, if necessary, on into the bore of the arbor. Boring-bars, boring-cutters, and bushings for the bar will of course be .chosen of a size adapted for the work in hand, the boring-bar being secured in the tail-spindlein a manner common in attaching drills and boring-bars in the spindles of drilling and boring machines.

I claim as my invention- 1. In alathe, the combination, substantially as set forth, with a bed, a head-stock, an arbor, a tail-stock, and a slide-rest, of a spindle fitted to rey olve and slidein the tail-stock, a boring bar secured to said tail-spindle, a shaft reaching from the head-stock to the tail-stock, and gearing arranged to transmit motion from the arbor to said shaft and from said shaft to said tail-spindle.

2. In a lathe, the combination, substantially as set forth, with abed, a head-stock, an arbor,

and a pair of rails supported by the bed, of a shaft journaled in the head-stock below and parallel with the arbor, gearing arranged to transmit motionfrom the arbor to said shaft, a feed-crank upon said shaft below the nose of the arbor, and a pair of feedrods engaging said crank and the feed mechanism of the rails.

3. In alathe, the combination, substantially as set forth, of a bed, a headstock, an arbor, a tail-stock, one or more slide-rests, a tailspindle fitted to slide and revolve in the tailstock, boring-bar attached to the tail-spindle, a shaftjournaled in the bed parallel to the axis of the lathe, gearing arranged to transmit motion from the arbor to said shaft and from said shaft to said tail-spindle, a feed-crank upon the tail end of said shaft, and a rod engaging ICC said feed-crank and a feed mechanism for the PETER SHELLENBAOK.

Witnesses:

' S. E. SWAYNE,

LEONARD T. LEMON, 

